/Engine/Source/Runtime/MovieScene/Public/Channels/MovieSceneChannelProxy.h
Make a channel handle out for the specified index and channel type name
A handle to the supplied channel that will become nullptr when the proxy is reallocated, or nullptr if the index or channel type name are invalid.
[FMovieSceneChannelHandle](API\Runtime\MovieScene\Channels\FMovieSceneChannelHandle) MakeHandle ( [FName](API\Runtime\Core\UObject\FName) ChannelTypeName, int32 Index )